From ff3a5935fc73398edaadaad685915f9246748ab2 Mon Sep 17 00:00:00 2001
From: Salvo 'LtWorf' Tomaselli <tiposchi@tiscali.it>
Date: Tue, 17 Nov 2015 23:52:26 +0100
Subject: [PATCH] Use _make_writable also in delete function

This way the _make_writable can be changed in one place.
---
 relational/relation.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/relational/relation.py b/relational/relation.py
index 58323bd..d08142a 100644
--- a/relational/relation.py
+++ b/relational/relation.py
@@ -460,7 +460,7 @@ class Relation (object):
         Returns the number of affected rows.'''
 
         l = len(self.content)
-        self._readonly = False
+        self._make_writable(copy_content=False)
         self.content = self.difference(self.selection(expr)).content
         return len(self.content) - l